JP3230971B2 - Hollow board made of synthetic resin bonded by ultrasonic fusion - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow board made of thermoplastic resin of various forms used as a packaging material such as a box, a partition, a building material such as a wall, and more particularly, a means for irradiating a surface joint portion with ultrasonic waves. The present invention relates to a synthetic resin hollow board that compresses and fuses a surface bonding portion by assimilation and assimilates a bonding material.

[0002]

BACKGROUND OF THE INVENTION The present invention relates to a hollow dumpler board in which two leaves of a sheet of a thermoplastic synthetic resin are parallel to each other and formed integrally with each other through a number of ribs. It is widely used in various fields, in addition to partition boards and building materials such as walls.

[0003]

2. Description of the Related Art One of processing means of a hollow board made of synthetic resin.
As a technique using the ultrasonic fusion method as a seed, there is a patent application filed on November 14, 1995 by the same applicant as the present applicant.

[0004]

Originally, a hollow board made of synthetic resin (hereinafter referred to as a hollow board) was developed as an alternative material to a known cardboard, and was hollow compared to conventional paper-type cardboard. Since the board is extremely excellent in durability, it was studied as a substitute for paper-type corrugated cardboard at the beginning of development, and it has been in the direction of following the conventional paper-type corrugated product as it is, but it has been progressing more than this paper-type corrugated product. Because of its high durability, it deviates from the range of application of paper-type corrugated cardboard, and its products are being used more and more.

[0005] However, the hollow board has a difficulty in workability as compared with the above-mentioned paper cardboard. It lies in bonding technology.

[0006] As the joining means for the paper-type corrugated cardboard, adhesive tape, stapling, riveting and the like are used as well as joining with an adhesive.

Although the above-mentioned joining means may be applied to a synthetic resin hollow board as well, particularly in the case of joining with an adhesive, the hollow board has a larger load-bearing capacity than a cardboard made of paper, so that the weight is large. When the container is assumed to be a container having a different content, the reliability of the adhesiveness is low, and the same applies to the case of using an adhesive tape.

When a stapler, a rivet or the like is used as the joining means, it is impossible at all if airtightness and watertightness are desired.

On the other hand, for a synthetic resin hollow board, heat welding, high frequency welding, etc., which could not be used for paper corrugated cardboard at all, are based on a synthetic resin, which is a basic technical technique. Though possible as an idea, in practical terms,
There are many inconveniences such as workmanship of the finish and burnt-out of the construction site. To overcome these problems, there is a disadvantage that advanced technology is required and low productivity must be greatly improved. .

Accordingly, a first object of the present invention is to provide a hollow board in which two ends are overlapped and joined so as to be assimilar in material.

A second object of the present invention is to provide a hollow board having a board-bonded fused portion on a board surface by means of a heating and fusing means utilizing ultrasonic waves (hereinafter referred to as "ultrasonic welding"). .

A third object of the present invention is to provide a hollow board in which a fusion bonding portion for surface bonding has a thickness equal to or less than the thickness of a portion to be fused.

A fourth object of the present invention is to provide a single hollow board by joining two hollow boards with their respective ends overlapped and bonded to each other, and fusing the joined portions.

A fifth object of the present invention is to bend one hollow board, superimpose both ends of the hollow board and join the faces, and fuse the joined parts to form a round or square cylindrical shape. It is to provide a hollow board.

[0015] A sixth object of the present invention is to provide a cubic container in which, when a cubic container is used as a product, end portions of required surfaces are surface-joined and the surface-joining portion is fused. is there.

A hollow board is provided in which the end of one hollow board is folded in such a manner that a required number of layers can be formed, compressed and fused to form a tough rigid edge at the end. It is in.

[0017]

According to the present invention, as a means for achieving the above object, a first invention is directed to a thermoplastic synthetic resin obtained by integrally molding two parallel sheets through a number of ribs. The ends of the hollow board made are surface-bonded, the outer surface of the surface-bonded portion is pressed against each other, and the pressed portion is ultrasonically welded, and the welded portion is equal in thickness to one hollow board or They are compressed and joined so as to be equal or less.

According to a second aspect of the present invention, two ends of a thermoplastic synthetic resin hollow board in which two parallel sheets are integrally formed via a number of ribs are surface-joined, and the surface-joined portion is formed by joining the two surfaces together. The two outer surfaces are pressed against each other, the pressed portions are ultrasonically welded, and the welded portions are compressed and joined to have a thickness equal to or less than the thickness of one hollow board.

According to a third aspect of the present invention, a thermoplastic synthetic resin hollow board is formed by integrally molding two parallel sheets through a large number of ribs, and the both ends are surface-joined to form a round cylindrical shape. The joint portion is pressed against both outer surfaces thereof, and the welded portion is ultrasonically welded, and the welded portion is compressed and joined so as to have a thickness equal to or less than the thickness of one hollow board. It is characterized in that it is surface-bonded by ultrasonic fusion.

According to a fourth aspect of the present invention, there is provided a hollow sheet made of a thermoplastic synthetic resin, in which two parallel sheets are integrally formed via a number of ribs, and both ends of which are surface-joined to form a square cylindrical shape. The two parts are pressed against both outer surfaces and ultrasonically welded at the welded point, and the welded area is compressed and joined so as to have a thickness equal to or less than the thickness of one hollow board. It is.

The fifth invention is based on a thermoplastic synthetic resin hollow board obtained by integrally molding two parallel sheets through a large number of ribs, and develops a shape necessary for forming a cubic container. While increasing the overlap margin at the necessary points on the peripheral side, forming an unfolded shape plate having an overlapping surface on the opposite side, forming a cube by bending the boundary of each unfolded shape plate with each component surface Then, the overlapping margin of the adjacent constituent surfaces and the overlapping surface are joined and pressed together, and the welded portion is ultrasonically welded, and the welded portion is equal to or equal to the thickness of one hollow board. A synthetic resin hollow board which is surface-bonded by ultrasonic fusion, characterized in that it can be compressed and joined as follows to form a cubic container.

According to a sixth aspect of the present invention, there is provided a hollow board made of a thermoplastic synthetic resin in which two parallel sheets are integrally formed via a number of ribs, with each surface necessary for forming a cubic container, and A unit surface member having an overlapping margin, an overlapping surface, etc. is formed on the side edge portion, and the side edge portion of the unit surface member is overlapped so that the unit surface member becomes a surface portion necessary for forming a cubic container. Then, the welded portions are ultrasonically welded, and the welded portions are compressed so as to have a thickness equal to or less than the thickness of one hollow board and joined to form a cubic container. It is something that can be done.

According to a seventh aspect of the present invention, an end portion of a thermoplastic synthetic resin hollow board in which two parallel sheets are integrally formed via a number of ribs is formed with double layers or double or more layers having appropriate width dimensions. Folded portions are compressed so as to have a size smaller than the total thickness of the material of the number of layers to be folded, and are fused and bonded by ultrasonic irradiation to the tough rigid portion at the side edge of the hollow board. Are formed by ultrasonic bonding and are surface-bonded.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION A hollow board 1 made of synthetic resin according to the present invention comprises two sheets,
a and the back sheet 1b will be described below. However, these hollow boards 1 are not substantially distinguished as front and back. The front sheet 1a and the back sheet 1b are parallel to each other, and are integrally formed with a number of ribs 1c.

The hollow board 1 includes the front and back sheets 1 described above.
a, 1b and the thickness of each forming member with the rib 1c, the rib 1
There are a plurality of types having different heights and gap widths of c.

As described above, the front and back sheets 1a, 1b and the ribs 1c have been described for each part. However, these hollow boards 1 are formed by extrusion in the longitudinal direction of the hollow 1d formed by the ribs 1c. The body is made of a thermoplastic synthetic resin such as polypropylene, polyethylene, and polycarbonate.

The outline of the operation of the means for performing ultrasonic processing on the hollow board 1 will be described in brief. The ultrasonic wave is applied to a desired position on the hollow board 1 in the front and back directions. Therefore, the irradiated ultrasonic wave penetrates either the front or back surface material, and
It propagates through the rib 1c, generates heat by its oscillating action, and melts. Therefore, the presence of the rib 1c as an ultrasonic wave propagation path is an important element.

The hollow board 1 itself has
If pressure is applied in the reverse direction, it can be physically compressed to the material thickness. That is, the hollow 1d portion can be eliminated by pressurization.

According to the present invention, the desired margins 3 for superimposing the end portions 2 and 2 of the hollow boards 1 and 1 in different directions in the front and back directions of the hollow boards 1 and 1 are applied by pressing from the front and back directions. The compression is performed so that the bonding thickness after fusion at the fusion portion is equal to or less than the unit thickness of the hollow board 1 before processing.
By irradiating ultrasonic waves to the heavy hollow boards 1 and 1 for a set time, the superposed surface 3a (middle layer) is melted by the heat generated by molecular vibration (entropy), and the fused portion 1e of the two joined portions is melted. Ends the irradiation work after assimilation into one substance and fusing.

Upon completion of the ultrasonic irradiation operation, the melted portion falls to room temperature in a relatively short time and is solidified by molecular assimilation to complete the welded portion 4.

The volume that changes when the melting phenomenon occurs during ultrasonic irradiation is read during compression before the irradiation step, and is added so that the finished thickness after fusion becomes the desired thickness. It is important to compress it.

In the present invention, the fusion operation in ultrasonic waves is mainly based on surface bonding, and the means is mainly at the end of the hollow board 1. The basic shape is to form a single plate-like body 5 by joining and fusing together such as the left end and the right end of another plate.

Further, one hollow board 1 is rounded into a cylindrical shape, and the right and left ends thereof are overlapped to form a desired joint surface width 6 mm.
Pressing and compressing the overlapping part of the size of, and irradiating ultrasonic,
It causes a melting phenomenon and fuses.

By joining both ends of one hollow board 1 in this manner, a cylindrical body 7 is formed, and the shape of the cylindrical body is a round shape 7a or a square shape 7b.

The main purpose of the use of the cylindrically shaped article of the present invention is to construct a box body.

More specifically, when the entire box material 8 is formed from a synthetic resin hollow board 1, the required side wall surface material 8a and bottom member 8b required as a cubic container door are required. Is a square 7 of the above-mentioned cylindrical body 7 (see FIG. 8).
When the bottom member 8b is added to b, when the material is formed in a developed shape (see FIG. 10) required as a cubic container, the unit surface member of each constituent surface portion is used as the cubic container in some cases. A cube is formed by joining the side edges.

These joining means are used for joining 2
On one of the two sides, an overlapping margin 3 is extended and on the other side, a part thereof is used as an overlapping surface 3a, and these are overlapped. It is compressed so as to have a thickness dimension equal to or less than the same, and is welded by irradiating ultrasonic waves.

As described above, the portion where the two layers are overlapped can be compressed to have a thickness equal to or less than the thickness of one hollow board 1. A frame 9 having a substantially U-shaped cross section having a thickness dimension as a groove width can be fitted and joined to an edge of the welded portion 4 orthogonal to the longitudinal direction.

The ends of the thermoplastic synthetic resin hollow board 1 in which two parallel sheets are integrally formed via a number of ribs 1c are formed into double layers or double or more layers with appropriate width dimensions. As shown in FIG.
Is formed so as to be smaller than the total thickness of the material of the number of folded layers, and is fused and bonded by ultrasonic irradiation to form a tough rigid portion 11 on the side edge of the hollow board 1. It is.

As described above, the melting means by ultrasonic irradiation has been described with the direction matching the longitudinal direction of the rib 1c in the synthetic resin hollow board 1, but the direction of fusion is related to the direction of the hollow board 1. Instead, it can be implemented in any direction.

[0041]

As described above, according to the present invention, two ends of a synthetic resin hollow board formed by integrally molding parallel front and back sheets through a number of ribs are overlapped, and the overlapped portion is pressed. By compressing and bonding by ultrasonic fusion means, it is possible to compress and fuse to a thickness equal to or less than that of one hollow board even though the bonding portion is two hollow boards. , While providing a strict plate or cylindrical body with uniform thickness dimensions,
It has the effect of crushing the opening or groove at the end of the hollow board to cut off the flow of material to the hollow, and eliminating traces of the protruding side at the end to form a smooth joint surface. It is.

Further, the end of the hollow board is folded so as to have a desired number of layers, and the folded portion is compressed so as to have an arbitrary thickness smaller than the total thickness of the number of folded layers. Irradiation of a sound wave is effective in melting and assimilation while maintaining the compressed form to form a tough rigid portion at the edge of the hollow board.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a synthetic resin hollow board showing a joint portion,

FIG. 2 is an enlarged sectional view of a synthetic resin hollow board veneer,

FIG. 3 is an enlarged cross-sectional view of a synthetic resin hollow board showing a joining means;

FIG. 4 is an enlarged cross-sectional view of a synthetic resin hollow board showing a joining and melting means.

FIG. 5 is an enlarged sectional view of a synthetic resin hollow board showing an ultrasonic processing state;

FIG. 6 is an enlarged cross-sectional view of a synthetic resin hollow board showing a plurality of sheets joined together to form one sheet;

FIG. 7 is a cross-sectional view of a hollow cylindrical synthetic resin hollow board formed by joining both ends of one sheet;

FIG. 8 is a cross-sectional view of a rectangular tubular synthetic resin hollow board having both ends joined together,

FIG. 9 is a partial perspective view in which a frame member is fitted to an edge of a hollow board joined together;

FIG. 10 is a plan view of a developed shape plate of a box formed of a hollow board,

FIG. 11 is a plan view of each unit surface member of a component forming a box formed of a hollow board;

FIG. 12 is an enlarged cross-sectional view of the end of the hollow board in which the edge is folded.

FIG. 13 is an enlarged cross-sectional view of an end of a hollow board showing a fusion portion of a bent portion at an edge.

[Explanation of symbols]

1 hollow board, 1a front sheet, 1b back sheet,
1c rib, 1d hollow, 1e melting part, 2 end,
3 Overlap allowance, 3a Overlap surface, 4 welded part, 5 plate-shaped body, 6 joint surface width, 7 tubular body, 7
a Round shape, 7b square shape, 8 box material, 8a side wall surface material, 8b bottom member, 8c unfolded shape plate, 8d unit surface member, 8e boundary line, 9 frame material, 10 folded part, 11 tough rigid part.

Continuation of the front page (56) References JP-A-7-9563 (JP, A) JP-A-57-120412 (JP, A) JP-A-56-53029 (JP, A) JP-A-54-11960 (JP) , U) WO 94/2364 (WO, A1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 65/00-65/78 B32B 3/12 B65D 5/00-5/76

Claims (7)

(57) [Claims] 1. An end portion of a thermoplastic synthetic resin hollow board obtained by integrally molding two parallel sheets through a large number of ribs, and surface-joining the surface-joining portions to both outer surfaces thereof, and
The press-welded portion is ultrasonically welded, and the welded portion is compressed and joined so as to have a thickness equal to or less than the thickness of one hollow board, and is bonded by ultrasonic welding. Hollow board made of synthetic resin. 2. A thermoplastic synthetic resin hollow board in which two parallel sheets are integrally formed via a number of ribs, and one end of each of the two sheets is bonded to each other, and the two outer surfaces are pressed against each other. And ultrasonically welding the welded portion, and compressing and joining the welded portion so as to have a thickness equal to or less than the thickness of one hollow board. Hollow board made of synthetic resin that is surface bonded by wearing. 3. A thermoplastic synthetic resin hollow board formed by integrally molding two parallel sheets through a large number of ribs, and both ends of which are surface-bonded into a round cylindrical shape. It is characterized in that both outer surfaces are pressure-welded, and the welded portion is ultrasonically welded, and the welded portion is compressed and joined to be equal to or less than the thickness of one hollow board. A synthetic resin hollow board that is surface bonded by ultrasonic fusion. 4. A two-leaf parallel sheet made of a thermoplastic synthetic resin hollow board formed integrally with a large number of ribs by surface joining at both ends to form a square tube. The outer surface is pressed, and the welded portion is ultrasonically welded, and the welded portion is compressed and joined to have a thickness equal to or less than the thickness of one hollow board. Hollow board made of synthetic resin that is surface bonded by ultrasonic fusion. 5. A developed shape necessary for forming a cubic container, made of a thermoplastic synthetic resin hollow board obtained by integrally molding two parallel sheets through a number of ribs, and a peripheral side of the hollow board. In addition to increasing the overlap margin at the required locations, forming a developed shape plate provided with a superimposed surface on the opposite side, bending a boundary line with each component surface portion in the developed shape plate to form a cube, and making them adjacent The overlapping margin of the constituent surface and the overlapping surface are joined and pressed, and the welded portion is ultrasonically welded so that the welded portion is equal to or less than the thickness of one hollow board. A hollow board made of synthetic resin, which is surface-bonded by ultrasonic fusion, characterized in that it can be compressed and joined to form a cubic container. 6. A thermoplastic synthetic resin hollow board material formed by integrally molding two parallel sheets through a large number of ribs, at each surface portion required to form a cubic container, and at the side edges thereof. A unit surface member having an overlapping margin, an overlapping surface, etc. is formed on the portion, and the side edges of the unit surface member are overlapped and pressed against each other so that the unit surface member becomes a surface portion necessary for forming a cubic container. And, the press-welded portion is ultrasonically welded, and the welded portion is compressed and joined to have a thickness equal to or less than the thickness of one hollow board so that a cubic container can be formed. A hollow board made of synthetic resin formed by surface bonding by ultrasonic fusion. 7. An end portion of a thermoplastic synthetic resin hollow board obtained by integrally molding two parallel sheets through a number of ribs so as to form a double or multiple layers with appropriate width dimensions. By compressing the folded portion so as to have a dimension smaller than the total thickness of the material of the number of folded layers, and forming a tough rigid portion at the side edge of the hollow board by fusion bonding by ultrasonic irradiation. A hollow board made of synthetic resin which is surface-bonded by ultrasonic fusion.